This.
The thing about Michael is he's the character we HAVE to connect with. In order for a story to work, you have to be able to be on a level with the main character. Especially in a story that's full of betrayals as this one. Yeah, you may be able to love other characters more than Michael, but when it comes down to it, Michael is the one that hold it all together. If he lets it all loose, well we'll all be lost with a true sense of direction.
That, and he also took Pippin in. He could, in theory, let him loose to the zombies whenever he wants. Why would any sane man ever go through the trouble of keeping him here just to cause all of this ruckus?
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